Oil-lift



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OIL u n.

APPLICATION FILED MAR. 27,1920. 1 ,35 8,628. Patented Nov. 9, 1920. v V 2 SHEETS-SHEET I.

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OIL LIFT.

Patented Nov. 9, 1920.

- 2 SHEETS SHEET 2.

A TTOH/VEYS UNITEDv STATES PATENT OFFICE.

I CHARLEY WILLIAM FISHER, OF COFFEYVILLE, KANSAS.

OIL-LIFT.

Application filed March 27, 1920.

T 0 all whom it may concern:

Be it known that I, CHARLEY WILLIAM FISHER, a citizen of the United States, and a resident of Coffeyville, in the county of Montgomery and State of Kansas, have 1nvented certain new and useful Improvements in Oil-Lifts.

My invention relates to improvements in oil lifts and more particularly to an improved oil lift of the swab type.

An important object of my invention is to provide an improved swab oil lift which will automatically operate to discharge any oil above the swab in excess of the capacity of the lift and to efficiently retain all oil thereabove within the capacity of the lift.

Another object is to provide an improvement of this kind entirely self-acting 01' automatic as well as highly reliable in its operation, and of strong, and durable con struction and easy and inexpensive to manufacture.

@ther objects and advantages reside in the certain novel features of the construction, arrangement and combination of parts and will become apparent as the description proceeds reference being had to the accompanying drawings forming part of the specification and in which Figure 1, is an elevational view partly in section of my improvement,

2, is a vertical section through the inlet and discharge chamber, and,

Fig. 3, is a horizontal section on line 3--3 of Fig. 2.

Referring to the drawings it will be seen my invention contemplates a swab consisting of a body portion 5 having at its upper end a tapered externally threaded shank 6 for attachment to the tool (not shown). The inner end of the body portion 5 is provided with an axial bore 7 of relatively great cross section and a series of radial bores 8 of relatively reduced cross-section communicating with the axial bore 7 and leading to the 8X7 terior. These radial bores constitute an out- An annular flange 9 is integrally formed with the lower end of the body portion.

The lower end of the axial bore 7 of the body portion is screw threaded as at 8 and secured in threaded engagement therewith is a tube 10 open at bothends and having its lower end exteriorly threaded for a considerable portion of its length as shown at 11. A rubber 12 of hollow cylindrical form Specification of Letters B atant.

rammed Nov. 9,1920.

Serial No. 369,330.

is arranged on the tube 10 and has its upper end abutting the flange 9 of the body portion 5. Threaded upon the lower end. of the tube 10 is an annular bearing plate 13 which bear; against the lower end of the rubber 12 and a lock nut 14 maintains thebearing plate 13 in adjusted position. It is to be noted that in assembled position a substantial portion of the lower threaded end of the tube 10 projects beyond the lock-nut 14.

An inlet and discharge chamber in the form of a hollow cylindrical casing 15 is open at both ends and has its upper end in teriorly threaded as shown at 16 and is thereby secured upon the lower projecting end of the tube 10. The lower end of the casing is also interiorly threaded to receive an inlet plate 17 having a circular series of ports. 18 constituting an inlet and a central upper stem. The upper stem 24: is mounted for rectilinear movement in the opening 22 and the lower stem 25 is similarly mounted, in the opening 19 and in this manner the valve 23 is guided in its operative movements. The upper face of the inlet plate 17 is formed to constitute a valve seat for the valve 23 and this valve controls the flow of fluid through the ports 18.

The casing 15 preferably near the upper end thereof is provided with a discharge port 26, the wall of which flares or inclines outwardly and is ground to form a valve seat as shown. A discharge valve 27 havin its side wall correspondingly inclined wit respect to the inclined wall of the discharge port controls the flow of fluid th ough said its outer end against an abutment 33 secured to the valve stem 28 and preferably in the form of a collar adjustably threaded on the valve stem 28. The spring 32 forces the is mounted in the guide opening casing Valve stem 28 inwardly and so maintains the valve 27 closed, to prevent discharge of fluid through the discharge port 26.

in operation, on the down stroke that is when the swab is lowered, the valve 23 is elevated or open as shown in Fig. 2, admitting the oil upwardly through the ports 18, 15, tube 10 and bores '7 and 8 to above the swab. On the up stroke that is when the swab is raised, the oil above closes the valve 23 which retains the oil above the swab. The rubber packing l2 prevents the oil from going by the swab and the inside of the well casing. In practice however it frequently occurs that more oil is admitted above the swab than it is possible to-lift and in such event serious. straining or rupture of the parts, as well as faulty or complete cessation of operation and other serious difliculties and disadvantages invariably result. It is important therefore that the excessive oil above the swab be discharged to below the swab immediately at the moment it exceeds a predetermined point which is the moment it exceeds or rather is about to exceed the efficient capacity of the lift. The spring 32 is of such strength and tension as to maintain the valve 527 closed under normal conditions that is as long as the oil above the swab is within the efficient capacity of the lift. As soon as the oil above the lift is about to exceed the capacity of the lift, the force of the resistance of the oil to the motion of the swab overcomes the action of the spring 32 forcing the valve 2'? outwardly and permitting free discharge of the oil from above to below the swab. The valve is entirely eashes self-acting or automatic and when the resistance of the oil above the swab to its upward motion or lift is reduced to within the capacity of the lift it automatically seats to prevent further discharge. in this manner the swab operates reliably and efficiently An oil lift of the character described comprising in combination with a swab having a passage therein and an outlet; communicating with said passage, of an inlet and discharge chaniber secured to said swab and communicating with the passage of said swab and including a discharge outlet in the upper side wall thereof having an outwardly inclined valve seat, an automatic self-acting valve adapted to control said discharge outlet and having a corresponding inclined wall and provided with a valve stem, a spider cast integral with said chamher and spaced inwardly from said discharge outlet having a hub provided with a guide opening for said valve stem, an abutment adjustably secured to the outer end of said valve stem and a spring mounted on said valve stem and hearing against said abutment; and said spider hub whereby said valve is normally closed and automatically opens when the force of resistance of the oil above said swab to the upward motion or lift exceeds a redetermined point.

GHARLE VVIELLIAM 

